Simplify 
, leaving your answer as a fraction where appropriate.
Definitions:
Homo Sapiens
The scientific name for modern human beings, characterized by upright posture, complex language capabilities, and advanced cognitive skills.
Life Span
The duration of time from the birth to the death of an organism, focusing on the various stages and changes experienced throughout this period.
Cognitive Development
The process involving growth and change in intellectual abilities such as thinking, reasoning, and problem solving.
Piaget
A rephrased definition: Known for his influential theory on the stages of cognitive development in children, emphasizing how they construct and understand the world.
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